PHP正規表現での末尾改行 ref: http://qiita.com/MTattin/items/0ad9af5bbefe15c59c08

file0.php

$options = ['options' => [
    'flags' => FILTER_FLAG_ALLOW_OCTAL,
    'regexp' => '/^[[:^cntrl:]]{0,5}$/u',
]];

$var = filter_var("アイ\nウ07", FILTER_VALIDATE_REGEXP, $options);
echo '"アイ\nウ07"'."\n";
var_dump($var);
echo "\n";

$var = filter_var("アイウ07\n", FILTER_VALIDATE_REGEXP, $options);
echo '"アイウ07\n"'."\n";
var_dump($var);
echo "\n";

$var = filter_var("アイ\n", FILTER_VALIDATE_REGEXP, $options);
echo '"アイ\n"'."\n";
var_dump($var);
echo "\n";

$var = filter_var("\nウ07", FILTER_VALIDATE_REGEXP, $options);
echo '"\nウ07"'."\n";
var_dump($var);
echo "\n";

$var = filter_var("\n\nウ07", FILTER_VALIDATE_REGEXP, $options);
echo '"\n\nウ07"'."\n";
var_dump($var);
echo "\n";

$var = filter_var("\n", FILTER_VALIDATE_REGEXP, $options);
echo '"\n"'."\n";
var_dump($var);
echo "\n";

$var = filter_var("アイウ07", FILTER_VALIDATE_REGEXP, $options);
echo '"アイウ07"'."\n";
var_dump($var);
echo "\n";

$var = filter_var("", FILTER_VALIDATE_REGEXP, $options);
echo '""'."\n";
var_dump($var);
echo "\n";

file1.txt

"アイ\nウ07"
bool(false)

"アイウ07\n"
string(12) "アイウ07
"

"アイ\n"
string(7) "アイ
"

"\nウ07"
bool(false)

"\n\nウ07"
bool(false)

"\n"
string(1) "
"

"アイウ07"
string(11) "アイウ07"

""
string(0) ""

file2.php

$options = ['options' => [
    'flags' => FILTER_FLAG_ALLOW_OCTAL,
    'regexp' => '/^[[:^cntrl:]]{0,5}\z/u',
]];

以下上と同じ

file3.txt

"アイ\nウ07"
bool(false)

"アイウ07\n"
bool(false)

"アイ\n"
bool(false)

"\nウ07"
bool(false)

"\n\nウ07"
bool(false)

"\n"
bool(false)

"アイウ07"
string(11) "アイウ07"

""
string(0) ""